David,
This is the answer I was given- "Indexing" a spark plug is a matter of trial
and error, choosing one among several used or new plug gaskets (different
thickness), to get the plug to tighten just at the right place (gap facing
the compustion chamber, in the same position for all plugs), marked on the
body of the plug with permanent marker or such.
Jacques le Clainche in San Diego
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